"And then (I) started to have a few conversations and actually all of a sudden, all of this grief that I have never processed started to come to the forefront and I was like, there is actually a lot of stuff here that I need to deal with."

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He said he shut down his emotions after her death which had "a quite serious effect on not only my personal life but my work as well".

The prince sought help after Prince William advised him that he had to deal with the grief.

Harry said coping with the death of his mother while in the public eye had led him to coming "very close to a complete breakdown on numerous occasions".

He said boxing "saved" him after he took it up to deal with his aggression, after nearly "punching someone" when he was 28.

Prince Harry as a toddler with his mother, Princess Diana. Image via Getty.

Asked whether he had ever been to see a "shrink", he replied: "I've done that a couple of times, more than a couple of times, but it's great."

But he said that he was now in a "good place".

"Because of the process I have been through over the past two and a half years, I've now been able to take my work seriously, been able to take my private life seriously as well, and been able to put blood, sweat and tears into the things that really make a difference and things that I think will make a difference to everybody else."